Metal drum



l Api-il 18, 1933.

P; WOLF.

Filed sept. 28. 1929 l Patented Apr. 1933 IUNITED ,STATESl PATENT OFFICE PETER. woLE, or EssEN, GERMANY, AssIGNon 'ro FRIED :Knorr- AKTIENGESELLSCHAFT,

or EssENoNrEE-EUHR, GERMANY METAL Darm Application led September 28, 1929, Serial No. 395,952, and` in Germany October 27, 1928.

' The invention irelates to improvementsl in Vor modifications of metal drums ofthe type -portions are buttV jointed along the outer v described in the specification of United States Letters Patent to J. Knigge, No.

1,800,082, April 7, 1 931. VThe object of my present invention is to simplify the constructionof metal drums of this type.

In order that the invention can be more readily understood, a preferred embodiment of the same is illustrated by way of example in the accompanying drawing in which a jacketed metal drum according to the invention is shown in longitudinal section.

The drum proper comprising an inner shell which is made of stainless steel and possesses a sufficient strength, comprises a short cylindrical central section A and two tapered portions A1 which in their turn subside each \into a short cylindrical portion A2 at each extremity. Each of the latter has welded on it the appurtenant end wall B by means of an inward depressed edge portion' b1 whichextends rectangularl to and the diameter of which correspon s t'o the internal diameter of portion A2. Each end wall B is further provided withan annular outward depression '122.

The jacket comprising an outer shell which is made of a cheaper material, e. g. mild steel, and has a notably greater wall thickness than the drum, consists of' two pot-shaped halves which are slid on the drum from the ends. The shell portion C of the two halves of the jacket is of such a shape, that the jacket when assembled lhas a barreled. shape. The two periphery of a ring D D1 of angular cross section and are connected to one another vand to the latter by weldingalong'4 the leg D thereof. The leg D1 of ring D D1 abutslon the portion A of the drum but is not in connection thereto. v

Each of the`barreled portions C .toward its outer extremity subsides into a cylindrical portion C1 the diameter of which is so chosen that thecylindrical portion Az of the drum tightly fits therein; The portion C1 subsides into a bead C. formed `by bending the wall 180 degrees with a large radius, .which bead passes over into a short cylindrical portion pression b2 of the end wallB of the drum' 'n proper has an annular outward depression o5 of such a depth that a space exists between the depressions?)2 and 05. Radially inside 60 and outside the annular depressions` b2 and lc5 the walls AB and Careseparated by inserted sheets ofpressboard, or any other material of low heat 'conductivity which is somewhat elastic but has suflicie'nt strength. The inner circular pressboard sheet surrounded bythe depression b1 is denoted by E and the-outer, annular sheet by Ehm The depression b1 secures the sheets E and AE1 against radial displacement.

The drum is fitted in the usual manner with a spile hole socket F and a bung hole socket G. In the range of the latter the anglo ring D D1 is interrupted' and inthe range of-both sockets the jacket is provided with suitable apertures. Each shell half C of the jacket has welded on it a reinforcing angle ring H which like the ringzjDN 1 abuts on the drum but is not` connected thereto. Through the intermediary of the sheets E lE1 the drum is firmly held by the jacket in the longitudinal direction the drumbeing prevented from. loosening in the jacket even after 'long use owing to the rim C1 C2 C3 of the jacket being resilient. I

ln4 manufacturing the described druln the drumproper with the socket F and G is manufactured first. Thereupon the two halves of the jacket are slid onto the drum, after vpreviously the rings H have been weld- 90 ed onto the. two halves and ring 'D D1 onto one of them. Then the two halves are welded together and onto ring'D D1, during which operation they are pressed to one another from outside inlongitudinal direction, so as 95 to firmly abut on the" drum properduring f welding.

Bywelding, finally, thesockets F and 'G onto the jacket the manufacture of the described drum is terminated.

. proper having end walls and a substantially y'zend walls of the drum proper are 'substa'n- What I claim and desire to secure-by Letters Patent, isz- 1. A metal drum consisting of a drum proper having end walls and a substantially cylindrical shell, and of a jackethaving end walls too and a barreled shell, the jacket consisting of two pot-shaped halves, with the shell portion of each .of said pot-shaped halves subsiding into the respective end wall by a substantially U-shaped rim of abundant curvature, the drum proper being vconstructed as a unit independent of said jacket and firmly held within said jacket solely by the extremities of the shell of said drum proper abutting on the extremities of the shell of said jacket and the end walls of the drum proper abutting on the end walls of the jacket whereby the end walls of the drum proper.

are1 .substantially protected from being bellie l o 2. A metal drum 'consisting of a drum cylindrical shell, said drum proper slightly tapering from the midst toward both ends with said tapering portions subsiding each into a short cylindrical portion at the extremities ofsaid drum, and of a jacket having end Walls too' and a barreled shell, th'e jacket consisting of two pot-shaped halves, the drur'n proper being constructed as a unit independent of said jacket and firmly held withinsaid jacket solely by the extremities of the shell of said drum proper abutting on the extremities of the slre'll of said jacket and the end walls of the drum proper abutting on'the end walls of the jacket whereby the tially protected from being bellied.v

The foregoing specification signed at Cologne, Germany, this 14thday of September,

Y PETER- WOLF. 

